ShadowsPapa
Well-Known Member
- First Name
- Bill
- Joined
- Oct 12, 2019
- Threads
- 180
- Messages
- 29,600
- Reaction score
- 35,210
- Location
- Runnells, Iowa
- Vehicle(s)
- '22 JTO, '23 JLU, '82 SX4, '73 P. Cardin Javelin
- Occupation
- Retired auto mechanic, frmr gov't ntwrk security admin
- Vehicle Showcase
- 3
A bit over 10 years ago, just got the AC working after doing the engine swap. This was before I parked it for a year to prep and paint it.
The 4.0 still sounds about the same. This is with a Comp xtreme 4x4 cam, aluminum roller rocker arms, bumping up compression by shaving the head.
And - all new lifters and because of the head shaving and different rocker arms, I had to one at a time check the lifter preload and shim rockers to get preload right and center the rockers on the valve stems. So I know the valve train geometry is perfect.
(ignore that crap air filter - I used that just to get by until I grabbed a much better setup from a pick and pull and re-routed a lot of hoses and moved things around in the engine bay)
And yet with all of that work - it's not exactly quiet. Just how some things are. Frankly, I'm not sure Jeep changed anything regarding engine sounds 4.0 to 3.6.
The 4.0 still sounds about the same. This is with a Comp xtreme 4x4 cam, aluminum roller rocker arms, bumping up compression by shaving the head.
And - all new lifters and because of the head shaving and different rocker arms, I had to one at a time check the lifter preload and shim rockers to get preload right and center the rockers on the valve stems. So I know the valve train geometry is perfect.
(ignore that crap air filter - I used that just to get by until I grabbed a much better setup from a pick and pull and re-routed a lot of hoses and moved things around in the engine bay)
And yet with all of that work - it's not exactly quiet. Just how some things are. Frankly, I'm not sure Jeep changed anything regarding engine sounds 4.0 to 3.6.
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